Periglacial Landscape Evolution in Antarctica: New Constraints on Patterned Ground Formation

南极洲冰缘景观演化：对图案化地面形成的新限制

• 批准号: 0839045
• 负责人: Mark Kurz
• 金额: $ 19.15万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2010-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0839045&HistoricalAwards=false
• 关键词: Periglacial; Landscape; Evolution; Antarctica; New

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). The proposal seeks limited funds to exploit fully the samples and data collected during the 2007/2008 field season in Dry Valleys, Antarctica. The landscapes of the Dry Valleys region are among the oldest on Earth, some as old as Miocene, ~15 million years old. Although these inferred ages are relevant to the long-term stability of the East Antarctic Ice Sheet; the specific mechanisms and rates of landscape modification are not well constrained. Cryoturbation (most commonly recognized as patterned ground) is one of the primary landscape modifiers in periglacial environments. This project's effort will be focused to direct determination of cryoturbation rates and mechanisms using a combination of geochronology of field samples combined with the LiDAR landscape characterization. The cosmogenic 3He measurements will be completed on the depth profiles and surficial samples from Beacon Valley and Mount Morning. While the emphasis will be on 3He measurements as they can be done more quickly, the 21Ne measurements will be also undertaken on selected samples. The cosmogenic nuclide measurements are the most labor-intensive component of the proposed project.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。该提案寻求有限的资金来充分利用2007/2008实地季节在南极干山谷期间收集的样品和数据。干山谷地区的景观是地球上最古老的地区之一，有些年龄大约为1500万年。尽管这些推断的年龄与东南极冰盖的长期稳定性有关。景观修饰的特定机制和速率不太受约束。冷冻扰动（最常见的是图案化的地面）是冰期环境中的主要景观修饰符之一。该项目的努力将集中在直接确定冷冻扰动速率和机制，结合了田间样品的年代学结合与激光雷达景观表征相结合。宇宙生成的3HE测量将在Beacon Valley和Mount Morning的深度轮廓和表面样品上完成。尽管可以更快地完成3E测量的重点，但还将在选定的样品上进行21NE测量。宇宙基因核素的测量是拟议项目中最劳动密集型的组成部分。